45
TABLE 7
ALTERNATE METHOD FOR CANADIAN HIGH-ALTITUDE DERATE
IMPORTANT: 90 Plus Models only. Do not
use this chart for any 80 Plus Models
NATURAL GAS LP GAS
FIGURE 48
MANIFOLD PRESSURE-CHANGE LABEL
THE MANIFOLD PRESSURE OF THIS APPLIANCE HAS
BEEN FIELD ADJUSTED TO OBTAIN THE CORRECT
INPUT RATING FOR INSTALLATION AT ALTITUDES
BETWEEN 2,000 FEET AND 4,500 FEET ELEVATION.
LA PRESSION DU DISTRIBUTEUR D'ALIMENTATION
DE CET APPAREIL A ÉTÉ AJUSTÉ SUR LES LIEUX AFIN
D'OBTENIR LA BONNE PUISSANCE D'ENTRÉE POUR
UNE INSTALLATION ENTRE 2000 ET 4500 PIEDS
D'ALTITUDE.
92-24399-01-01
ALTERNATE METHOD FOR
CANADIAN
HIGH-ALTITUDE
DERATE
In Canada, unless an orifice change is
specifically mandated by local codes, an
alternate method of altitude deration
through a reduction in manifold pressure
is acceptable as described in
Table 8.
The information in Table 8 is based on a
heating value of 1000 BTU per cubic feet
of natural gas, and 2500 BTU per cubic
feet of LP gas.
IMPORTANT: Actual input rates must be
measured on-site with manifold pressure
adjustment to ensure that an actual 10%
reduction in input rate is achieved.
ALTITUDE
INPUT
OUTPUT
ORIFICE
SIZE
MANIFOLD
PRESSURE
0’ - 2000’
45,000
60,000
75,000
90,000
105,000
120,000
40,500
54,000
67,500
81,000
94,500
108,000
#50
3.5” W.C.
2001’ - 4500’
40,500
54,000
67,500
81,000
94,500
108,000
36,450
48,600
60,750
72,900
85,050
97,200
#50
3.0” W.C.
ALTITUDE
INPUT
OUTPUT
ORIFICE
SIZE
MANIFOLD
PRESSURE
0’ - 2000’
45,000
60,000
75,000
90,000
105,000
120,000
40,500
54,000
67,500
81,000
94,500
108,000
1.15mm
10” W.C.
2001’ - 4500’
40,500
54,000
67,500
81,000
94,500
108,000
36,450
48,600
60,750
72,900
85,050
97,200
1.15mm
7.6” W.C.
Once this field adjustment has been
made, the label shown in Figure 48
must be affixed in a conspicuous
location on the front of the furnace
cabinet:
NOTE: This label is supplied in the
information packet shipped with each
furnace.
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